"We noticed that you have not yet selected a "Most Helpful Opinion" yet" & blah blah blah.
I personally find it so annoying. Doesn't it remind you of Facebook when you're mislead into thinking that you have a useful notification when in fact it is just "George has invited you to play *stupid game*" ?
We're trying to encourage everyone to give credit where credit is due. We send one reminder every 7 days for 3 weeks. After 30 days, if you haven't selected a MHO on your question, the system will choose one for you based on engagement. To avoid seeing these messages at all, choose a MHO within 7 days.